摘要:
The invention concerns an aprotic electrolytic composition located in the separator and in at least one composite electrode containing a powder of an active electrode material, and if necessary an electronic conduction additive of an electrochemical generator The electrolytic composition comprises a first polymer matrix consisting of a polyether and at least a second polymer matrix, macroscopically separated, and also at least an alkaline salt as well as a polar aprotic solvent: The polymer matrices are capable of being swollen by at least one of the polar aprotic solvents. The solvent or mixture of solvents is unevenly distributed between the polymer matrices. The invention also concerns an electrochemical generator comprising a negative electrode and positive electrode reversible to alkaline ions and a separator with polymer electrolyte, the electrolytic component of which is the composition described above. The invention further concerns the manufacture in two or three steps of a sub-assembly of an electrochemical generator by coating an electrode support with a composite electrode containing the second matrix, followed by a surface coating on the electrode resulting from the preceding step with a solution containing the first polymer matrix so as to form the separator wholly or partly.
摘要:
Polymer or oligomer ionic compound made of a polycationic part (A.sup.+).sub.p comprising a plurality of onium units and a sufficient number of anions X.sup.- to provide electrical neutrality to the compound, characterized in thatthe onium units are selected from the group consisting of biaryliodonium, arylsulfonium, arylacylsulfonium, diazonium, organometallic cations comprising a transition metal which is complexed by at least one unsaturated cycle comprising 4 to 12 carbon atoms;X.sup.- is an imide anion [R.sub.F SO.sub.2 NSO.sub.2 R'.sub.F ].sup.- or a methylide anion [R.sub.F SO.sub.2 C(Q)SO.sub.2 R'.sub.F ].sup.- in which:1) Q represents:H--, Cl--, F--, Br--or CN--;an alkyl radical having 1 to 30 carbon atoms;an aryl, alkylaryl or arylakyl radical having 6 to 30 carbon atoms;a group R".sub.F or a group R".sub.F SO.sub.2 ;2) R.sub.F and R'.sub.F, as well as R".sub.F possibly when X.sup.- is a methylide anion, are independently selected from the group consisting of fluorine, perhaloalkyl groups having 1 to 30 carbon atoms, (perhaloalkyl)alkyloxy groups, perhalogenated cycloaliphatic groups having 3 to 30 carbon atoms possibly containing hetero atoms selected from O and N, and/or possibly comprising at least one perhaloalkyl chain, the perhalogenated aryl having 6 to 30 carbon atoms; or3) R.sub.F and R'.sub.F together form a bivalent radical constituting a cycle respectively with group --SO.sub.2 --N--SO.sub.2 -- or with group --SO.sub.2 --C(Q)--SO.sub.2 --, or when X.sup.- is a methylide anion, R".sub.F constitutes with one of the radicals R.sub.F or R'.sub.F a bivalent radical constituting a cycle respectively with group --SO.sub.2 --C--SO.sub.2 -- or group --SO.sub.2 --C--, said bivalent radical being selected from perfluorinated alkylene radicals having 2 to 12 carbon atoms, the third radical which is possibly present being selected from the monovalent radicals mentioned above in 2);4) p represents the number of onium units.These compounds are useful as photoinitiators for cationic polymerization or cross-linking of monomers or for the modification of polymers for example when they are used as photoresists. The preparation of these compounds is also disclosed.
摘要:
The present invention concerns electrode materials capable of redox reactions by electron and alkali-ion exchange with an electrolyte. The applications are in the field of primary (batteries) or secondary electrochemical generators, supercapacitors and light modulating systems of the electrochromic type.
摘要:
A process for making an electrode sheet for lithium electrochemical cells is disclosed. The process comprises the steps of: a) admixing a polyether polymer or copolymer soluble in water, at least one lithium salt, at least one electrochemically active material, water and an organic solvent miscible with water in a water/organic solvent ratio of a maximum of 50% organic solvent by volume to form a water-based solution/suspension containing by weight at least 20% active electrode material, at least 5% of a polyether polymer or copolymer, and at least 1.5% lithium salt; b) coating the water-based solution/suspension in the form of an electrode thin film onto an electrode support; and, c) drying the electrode thin film to obtain an electrode thin sheet having less than 1000 ppm of residual water.
摘要:
An electrode and an electrode material for lithium electrochemical cells are disclosed. The electrode material is in powder form and has a particle size distribution wherein the measured particle size distribution of the electrode material has a median size D50 ranging from 1.5 μm and 3 μm, a D10≧0.5 μm, a D90≦10.0 μm, and a calculated ratio (D90/D10)/D50≧3.0 which is indicative of a peak of the measured particle size distribution on the left of the median D50 which improves the loading and energy density of the electrode produced with this electrode material powder.
摘要:
The present invention concerns electrode materials capable of redox reactions by electron and alkali-ion exchange with an electrolyte. The applications are in the field of primary (batteries) or secondary electrochemical generators, supercapacitors and light modulating systems of the electrochromic type.
摘要:
The present invention concerns electrode materials capable of redox reactions by electron and alkali-ion exchange with an electrolyte. The applications are in the field of primary (batteries) or secondary electrochemical generators, supercapacitors and light modulating systems of the electrochromic type.
摘要:
The invention concerns an aprotic electrolytic composition located in the separator and in at least one composite electrode containing a powder of an active electrode material, and if necessary an electronic conduction additive of an electrochemical generator. The electrolytic composition comprises a first polymer matrix consisting of a polyether and at least a second polymer matrix, macroscopically separated, and also at least an alkaline salt as well as a polar aprotic solvent: The polymer matrices are capable of being swollen by at least one of the polar aprotic solvents. The solvent or mixture of solvents is unevenly distributed between the polymer matrices. The invention also concerns an electrochemical generator comprising a negative electrode and positive electrode reversible to alkaline ions and a separator with polymer electrolyte, the electrolytic component of which is the composition described above. The invention further concerns the manufacture in two or three steps of a sub-assembly of an electrochemical generator by coating an electrode support with a composite electrode containing the second matrix, followed by a surface coating on the electrode resulting from the preceding step with a solution containing the first polymer matrix so as to form the separator wholly or partly.
摘要:
A wood article is submitted to a vacuum in an autoclave to remove air that it contains. Then, a solution which contains a water-soluble cross-linkable prepolymer, a polymerization initiator and optionally a wood preservative is introduced into the autoclave. Polymerization to form a polymeric network in the wood article is carried out in an atmosphere which may be substantially free of oxygen, while the optionally present preservative is chemically fixed to the wood. The result is a wood article with a permanently reduced hardness and an increased moisture content at equilibrium.
摘要:
Polymer electrolyte compositions for lithium electrochemical generators of the LPB type (lithium polymer electrolyte battery), comprising a mixture of polymers wherein one of the components has a high molecular weight, such as those used currently in LPB batteries, and wherein the other component is a low molecular weight polymer resulting in a more efficient and faster multi-dimensional cross-linking by irradiation, so as to give a network which is interpenetrated or not and films of electrolyte being have better mechanical properties and lower thicknesses, while preserving the good properties of adhesion on the electrodes and the choice of the coating techniques.